Nuevo aparato ortopédico fijo para el tratamiento de maloclusiones clase II división 1. Reporte de caso.

Background: Early correction of class II malocclusions associated to mandibular retrognathism is possible through sustained and continuous mandibular advancement that does not require patient collaboration. Purpose: To describe a case of malocclusion treated with a new fixed mandibular advance arch (FMAA). Case description: FMAA was applied to a 11-year-6-month-old skeletal class-II, division-1 girl with mandibular retrognathism and overbite. Results: After one-year treatment, there were functional and esthetic outcomes. ANB angle was reduced from 6.6° to 5.0°. Effective mandibular length (Co-Gn) increased (96.1 mm to 103.4 mm). Upper incisors inclinations went from 28,0° to 28,4°. Lower incisors experienced slight proinclinations (26.2° to 30.9°). Cephalograms after orthodontic treatment showed stable measures: ANB went from 5.0° to 5,1° and Co-Gn remained stable in 103.4°. Upper incisors had retroinclinations from 28.4° to 22.5° and lower incisors went from 30.9° to 28.2°. Conclusion: FMAA is a treatment alternative for mixed and early permanent dentitions for being a fixed appliance, it allows advancing mandible without requiring patient collaboration and during the necessary time to obtain changes. Because of its simple structure (cemented in the maxilla only to first molars), it advances without being fixed to the mandible every time the patient closes the mouth. In addition, it is easy to make, cement, activate, clean, and keep in mouth. [ABSTRACT FROM AUTHOR]